I have a Powermax Pro and the backup battery failed and the CPU Low Battery warning is showing in the display and I am
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Synergy Digital Alarm System Battery, Works with Visonic Powermax Pro Alarm System, (Ni-MH, 9.6V, 2000mAh), Compatible with Visonic 0-9912-G, 100729, 103-300672, GP130AAH6BMX Battery - Walmart.com